Add a unique touch to your initiations, letters, or greeting cards with this set of 50 business envelopes. The black color envelopes has a smooth, blank surface that allows you to add custom lettering for the recipient with marker, paint, and stencils. Each of the black envelopes measures 9 1/2 x 4 1/8 inches, perfectly sized for invitations to a corporate event, office, party, wedding, or banquet.